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A tank can be filled in 30 minutes. There is a leakage which can empty the tank in 90 minutes. Therefore, the tank will be filled in A. 60 minutes B. 45 minutes C. 55 minutes D. 50 minutes

The half life period of a radioactive material is 15 minutes. What percent will remain after 45 minutes ?

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Find the ratio of the following: 30 minutes to 45 minutes .

Find the ratio of the following : 30 minutes to 45 minutes

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Write the equation of an S.H.M of amplitude 5 cm if 150 oscillations are performed in one minute and the intial phase is 45^(@)